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RE: Lower debt ratio with conversion of SBD?
The prices of the witnesses from the current round are used. There are 21 witnesses in each round, of which 20 are the TOP witnesses and 1 alternate witness in each round. If you like, the TOP witnesses have more weight because they are on more often. Otherwise, however, the prizes from each round are treated equally.
The witnesses determine the prices from various exchanges. I myself currently use four or five exchanges. In this respect, the price is already averaged worldwide. As you can see here, most prices don't vary that much.
Thank you, that makes sense.
Moreover, there are auto-trading services that track the prices among the exchanges and if there is a big difference they transfer funds and use the difference to gain some profit, so that all is like interconnected vessels in physics :) So querying all the possible exchanges would more or less be too much.
I found the steem price feed python script on github
The values in red on the steemworld witness page are those that fall outside some preset deviation, I suppose.
The red entries are outdated. But I don't know the detailed timeframe, when it is considered as outdated.